50/50 on what to think. The pyramids being a map of the stars is intriguing and shows how ancient man did some amazing things. But it could have also have been just a tomb, but why was it so plain and looked liked it wasn't used?
For reference I watched this video on it last night. The end of the video does get a bit ancient aliens-y but thankfully doesn't go too far. Great channel btw.
Wild Card Answer: They were indeed massive grain silos :ben-carson:
even so i think the star-map bits are completely reasonable until they look like
'they were sending astronomy students into the pyramid to look at constellations through the holes' the gulf between a tomb with constellation/star alignments for a neat visual effect or religious purpose---and a not-tomb pyramid structure with exclusive cosmological purposes is enormous
if they were building a structure to track stars they wouldnt mound 1000tons of limestone on top the viewing area
Where the facets of the pyramid totally covered? If so then yeah that would axe that idea.